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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41db083d8dbf057d53b592270bcb69695be6fb5b00808c228e765a9f2c1a245d' 
  AND token = 'CKIgZoU2xJobbuqHMHPuu0XkTMgWWB6dc+XKHfi3oVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}